Removing Account from "ram_principals" disrupts shared TGW with other accounts

[franciscojose-sanchezsanchez]

Description

When you remove an account from the ram_principals, the module will replace the associations and disrupt the current shared TGW by destroying and creating a new resource share.

This problem is related to how the module stores the aws_ram_principal_association in the state.
For example, you have:

module "tgw_use1" {
...
  ram_principals                = [
      "111111111111", #Acct1
      "222222222222", #Acct2
      "333333333333", #Acct3
      "444444444444", #Acct4
      "555555555555", #Acct4
  ]

and you remove the Acct3, the next plan/apply will return:

  # module.tgw_use1.aws_ram_principal_association.this[2] must be replaced
-/+ resource "aws_ram_principal_association" "this" {
      ~ id                 = "arn:aws:ram:us-east-1:<TGW_ACCT>:resource-share/<tgw_ram_resource_share_id>,333333333333" -> (known after apply)
      ~ principal          = "333333333333" -> "444444444444" # forces replacement
        # (1 unchanged attribute hidden)
    }

  # module.tgw_use1.aws_ram_principal_association.this[3] must be replaced
-/+ resource "aws_ram_principal_association" "this" {
      ~ id                 = "arn:aws:ram:us-east-1:<TGW_ACCT>:resource-share/<tgw_ram_resource_share_id>,444444444444" -> (known after apply)
      ~ principal          = "444444444444" -> "555555555555" # forces replacement
        # (1 unchanged attribute hidden)
    }

  # module.tgw_use1.aws_ram_principal_association.this[4] will be destroyed
  # (because index [8] is out of range for count)
  - resource "aws_ram_principal_association" "this" {
      - id                 = "arn:aws:ram:us-east-1:<TGW_ACCT>:resource-share/<tgw_ram_resource_share_id>,555555555555" -> null
      - principal          = "555555555555" -> null
      - resource_share_arn = "arn:aws:ram:us-east-1:<TGW_ACCT>:resource-share/<tgw_ram_resource_share_id>" -> null
    }

Describe the solution you'd like.

Maybe the list index could be replaced to the account number, so when the list is reordered it will nor remove existing shares.

Describe alternatives you've considered.

Manually edit the remote state removing the account and reordering the list.

Additional context

This will happen also if adding an account in the middle of the list.
Recreate because bug is not solved

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